Research On Thermodynamic Characteristics Of Natural Gas Assisted Concentrating PV/T Triple-Generation System For Cooling,Heating And Power

Carbon emission reduction is the only way to achieve social and economic sustainable development.In response to the limitations of China's distributed cooling,heating,and electrical distribution technology,it is necessary to study solar energy based on the pre-research work of the project group.This paper research on the natural gas assisted concentrating photovoltaic/thermal(PV/T)triple-generation system under intermittent and randomized effect,and its interaction mechanism.Establish the thermodynamic transport model of the triple-generation system.Exploration regulation mechanism and stable control method that can maximize intermittent and random sun energy for cooling,heating,and electrical load.Breakthrough in the active regulation of natural gas-assisted concentrating PV/T triple supply system under the multi-supply system.In order to provide new ideas and new methods for efficient,clean,low-cost distributed triple-generation technology,enriching the field of solar integrated utilization,broadening the application scenarios of distributed cooing,heating,and electrical.Specific research from the following four aspects::First,the performance of the low-concentrating PV/T system in different tracking modes is ascertained.In order to improve the PV/T performance,after adopting the concentrating technology,it is necessary to cooperate with the tracking device.Different axial tracking methods are divided into single-axis tracking and dual-axis tracking modes.Adjusting the direction and inclination of solar panels according to a specific geographic location and using a suitable concentrator can achieve the maximum collection and utilization of solar energy.Generally speaking,the thermal and electrical performance of concentrating solar panels is better than that of non-concentrating solar panels.The tracking system will significantly increase the radiation intensity received by the solar panels,thereby improving the photovoltaic and thermal performance of the panels.Therefore,tracking technology has broad application prospects in the field of solar energy utilization.In this paper,the exergy analysis method is used to discuss the performance of the single-axis system with different axial directions and the output characteristics of the dual-axis tracking system.Secondly,based on the principle of temperature matching and cascade utilization,combined with the intermittent and random characteristics of low-concentrating PV/T thermoelectric output thermodynamic energy field simulation and experimental results,coupled with heat pump technology,the establishment of a combined heat and power system under all working conditions is realized.The exergy analysis method is used to study the essential reasons for the reduced operating performance of the combined heat and power system and its potential for improvement,and reveal the energy conversion and cascade utilization mechanism of the combined power system under all operating conditions.Simulate the thermodynamic characteristics of the heating season of the LCPV/T system coupled heat pump combined heat and power system.From the perspective of energy cascade utilization,design the low-concentrating PV/T coupled heat pump combined heat and power system.And through the means of simulation to explore the thermodynamic characteristics of the system under all working conditions.Then build an experimental platform to verify and solve the performance of the combined heat and power system.Then,it explores the complementary cooling,heating,and electrical energy conversion mechanism of heterogeneous energy at multiple time and space scales,and breaks through the coupling mechanism of multiple thermodynamic energy fields in the natural gas-assisted low-concentrating PV/T trigeneration system.Based on the principle of temperature matching and cascade utilization,through the prediction and evaluation of the heat load,cooling load,domestic hot water,and system power consumption on the user side,the thermodynamic characteristics of the triple power supply system in all working conditions are analyzed,combined with intermittent and randomness The characteristic low-concentrating PV/T system outputs thermodynamic energy field simulation results,studies the interaction mechanism of heat pumps,natural gas and low-concentrating PV/T systems,and establishes a thermodynamic energy transport calculation model for the heterogeneous energy complementary triple-generation system.Finally,starting from the optimization problem,taking the aforementioned natural gas-assisted low-concentrating PV/T system as the research object,a method for the optimization and integration of heterogeneous energy complementary cold,heat,and power trigeneration systems is proposed.Use the combination of TRNSYS software and GenOpt to optimize the low-concentrating PV/T area,the volume of the hot water storage tank,and the three limited temperatures in the control strategy.Use the full life cycle analysis method to establish the coupling system optimization target and explore the benefits and costs the relationship between competition and game of the triple-generation system.